Pipe-threading die-stock.



'W. H. JU'ERGENS. PIPE THREAD-ING DIE STQCK. v APPLICATION FIL'D MAR.10, 1914; 4

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W. HL JUERGENS.

. PIPE THREADING DIE vSTOCK. APPLICATION FILED MAR. 1o, 19.14.

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1 WINFRED H. JUERGENS, CLEVELAND, OHIO.

PlPE-THREADING DIE-STOCK.

To all 'wim it ma? concern:

' Be it known't at I, WINFRED H. Jona Gers, a citizen of the UnitedStates, and resident of Cleveland, in the county. of Cuyahoga and Stateof Ohio, have. invented vcertain new and useful Improvements linPipe-Threading4 Die-Stocks, of which f I hereby declare the'followingto. be ajfull, clearJ and exact description, such'aswill enable othersskilled inthe art to which it appertains to makeand use the same.

,The object of the invention is to vprovide a die -stock for cutting ataper screw. thread upon pipes or other cylindrical products,

and the invention comprises a body portion and a' movable .membertherein, vin -which screw cutting dies are .slidably mounted andincludes automatically -acting means permitting progressively .andcontinuouslyV moving the diesto lessen the depth of the cutl and toproduce taper -threads as the -threads are cut farther into the.periphery of the work. i

The invention further includes the combi; nation and arrangement ofparts and construction of the various details hereinafter described,shown in the accompanying drawings and specifically pointed outin theclaims.

In the accompanying drawings Figure l is a central longitudinal sectionof the device; Fig. 2 is a plan view withthe die covers removed; Fig. 3is a plan view of a portion of the cam stud ring; Fig. 4 is a de-` tailview of one of the operating cams.; Fig. 5 is a perspective view of oneof the dies; Fig. 5- is a view of a cylindrical member used in place ofone of the cams whenia Istraight 4screw thread is to be-cut; Fig. 6

is a plan view of a die stock showing step? ping Hblocks intermediate ofthe dies and cams, by means of which the dies can be adjusted to cuttaper threads'upon pipes of diierent diameters; Fig. 7 is a perspectiveview of one of the stepping blocks; Fig. 8 is a perspective yview of oneof the dies adapted for use therewith; Fig. 9 is atplan view of one ofthe die covers; Fig. l() is a transverse section of die and cover online Fig. 9 showing the operating pin for one ofthe stepping blocks.

Iii-these views A is an annular member which is passed over the end of.the pipe upon which thescrew threads areto .be cut.

Within this member is secured -a sleeve Al through which the pipe passesand to which it is. Seemed .by one or 'mere @caserme A2.,

specification vof :Letters raient. Pawnee@ JmL 19, 1915,',

- Appiicaan fue@ irma in, 1am. serial No. 823,654.

Athird member A3 provided with a leadY screw a of the samepitch as thepitch of the threads to be cuton the pipe is attached to the member Aand is provided with a shoulder a' spaced'ffrom the end-of the member Ato form' a bearing for the disk D herel inafter described. lThe membersA, A and A3 are stationary. Y

B is a rotatable disk or body which car.4 riesra dially movable dies C,C, which move,l

in guide grooves B', B and are regularly' Y spaced in the disk B. 'Thesedies are provided with screw ,threads C, G, having-entf ting edges c2,c2, at the'inner ends.- The disk is provided with an integral tubularand central extension B2 through-which the pipe vpasses and "which isexternally Iscrew `threaded'at b to correspond With the-,insy

ternal screw thread a upon the stationary member A3. Handles E, E, areattachedto the4 'disk B at F, F, by means of which the disk is rotated;

As shown-in Figs. l and 2 .in the disk B at the rear of the dies arerotatably secured the cams G, G which make contact with the endsv ofthevfdies and they are partially r0-` ably secured to the disk D bymeans of screw threaded extremities d, ci, and nuts d', d. The studs Hpass 'through openings g, g, in the cams, and are provided with spiralgrooves i, 7L which are engaged by, pins g',-

g in the openings in the cams. f

In operation, as the disk B revolves and is fed longitudinally lof thestationary members A3 bv means of the lead screws the studs H, H, willpass through the cams vand rotate the cams so as to permit the dies tol.

` move continuallybackward and the cutting edges of the dies willgradually be removed from the pipe, thus cutting a ,screw thread ofgradually decreasing depth in the end of the pipe. Over the dies and camare placed the retaining caps or cover I, I, which are provided withineloserl openings l I to rcy ceive the ends of the studs as they areforced through the cams. The dies are prevented from falling'out bymeans of spring pressed balls Q, Q, which lie in grooves Q', Q in thedies, and permit a certainfamount. of

- to cut threads upon several sizes of pipe, andV provided with severalsurface levels, o, fu, I

movement in the dies, while limiting its eX- tent. Adjusting screws Q2,Q2 pressing upon the springs Q3, Q3, permit of the control of the amountof pressure exerted thereby. v

`When fine adjustment of the dies is r`equired to produce threads atrifle oversize or undersize, or of standardsize, the bases W upon whichthe operating studs for the cams are set are provided with a series ofspaced openings circula'rly arranged therein and each stud is providedwith a parallel pin X adapted for selective insertion in said holes,thus varying the angle of advance or retard ot the studs and having asimilar effect upon the cams. rlhe central opening w of each series ofopenings will controlthc standard size'` the holes at the left theundersize and the holes attheriglit the oversize.

ln Figs. 6, "7, 8, 9, and 10 an additional feature ist introducedshowing a stepping block V introduced between each die block and cam,permitting the die to be advanced o2, o3", against which the die blockwill rest when cutting pipes of two inch, 171; inch, 151; inch and'linch diameter respectively, or of any other required dimension. p

The die block is cut away at et, to provide clearance as the extremityof the die block giligages the .several steps upon the stepping ook.ping block a slot S is formed and in thisis and into an opening S in thestepping block a pin S2 is inserted by means of whichfthe stepping blockis moved from one position to the other. Anf-index upon the cover at oneside of the "slot permits the necessary provided with a correspondinglead screw, dies radially movable in said tubular body,

cams rotatably mounted in said tubular` adjustment to be made.

Having describedtheinvention what l claim as new and desire to securebyLetters Patent is. l,

l. In a die stock lfor cutting a tapering screw thread, in combination,a tubular'sta-I tionary portion provided with a lead screw, a revolublebody portion provided with a corresponding lead screw and having acentral opening, and radial guides therein,ydi es movable in saidguides, a cam for operating each die and havingacentral opening, arevoluble disk upon A"said stationary member, studs projecting from saidrevoluble disk through vsaid opening in said cams, said studs providedwith spiral .engaging means,

and'c'orresp'onding engaging vmeans upon said cams in said centralopenings therein.

2. ln a die'stock,.in combination, a tubular stationary member providedwith a lead screw, atubular body rotatable thereon, and

In the -cover for the diesv and st'cp-V anemia stationary memberprovided with a lead screw, a rotatable tubular body provided with a'corresponding lead screw and mounted thereon, dies radiallym'ovable insaid tubular body, a rotatable cam for operating each die and having acentral opening, a spirally grooved stud passing through each camopening, engaging means on each cam for said grooves in said studs, amember revoluble with said tubular body to which all said studs arerotatably secured, and means for adjusting the angular position of eachstud upon said support to control the amount of advanceand retard ofsaid cams;

4C. ln a die stock, in combination, a stationary tubular member providedwith a lead screw, a tubular body member rotatable thereon and providedwith a corresponding lead screw, dies radially movable in said tubularbody, cams for operating said dies, spirally grooved'studs passingthrough and engaging said cams a'coinrnoii sup-part for said studs, saidsupport rotatable with said tubular body, and covers for said dies, camsstuds, said covers permitting the free operation thereof, andimeans forlimiting .,tlie movement of said dies.

screw, dies radially movable in said body,

stepped blocks engaging said dies and adjustable in said bodv, camsrotatable -in said body and engaging said stepped blocks, and means forautomatically-rotating said cams to progressively advance said steppingblocks and dies as said body is advanced by said lead screw.

6. The combination in' a die stock, of a tubular rotatable member havinga lead screw, and a tubular stationary member having a correspondinglead screw, dies radially movable in said body, adjustable steppedblocks vengaging said dies, cams engaging said

